<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        function show(x){
            return x;
        }
        /* 参数只要一个可以不用小括号，输出语句只有一行可以不用大括号 */
        var go=x=>x;
        var test=z=>console.log(z)

        var gitInfo=(x,y)=>{
            console.log(x);
            console.log(x+y)
        }
        console.log(go(10))
        test(20)
    </script>
</body>
</html>